If you want to keep them then by all means! I wouldn't want to take them from you if you decide that you can keep them. Here is a link to an article about the different "types" so bumblebee gobies...
http://www.aquarticles.com/articles/breeding/McKane_Bumblebee_Gobies.html
http://www.aquarticles.com/articles/breeding/McKane_Bumblebee_Gobies.html